Berlin 2001 – scientific programme
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MO: Molekülphysik
MO 4: Posters Tuesday: Photoionisation
MO 4.6: Poster
Tuesday, April 3, 2001, 12:30–15:00, AT3
Non Franck-Condon effects in the photoionization of molecular oxygen to the O2+ X 2Πg state and of molecular nitrogen to the N2+ A 2Πu state in the 19-34 eV photon energy range. — •Jaume Rius i Riu1, Peter Erman1, Andrzej Karawajczyk1, Elisabeth Rachlew1, Marek Stankiewicz2, Leif Veseth3, and Piotr Winiarczyk2 — 1Sect. of Atomic and Molecular Physics, Department of Physics, Royal Institute of Technology, KTH, SE 10044 Stockholm, Sweden — 2Instytut Fizyki im. Mariana Smoluchowskiegeo, Univ. Jagiellonski, ul. Reymonta 4, 30-059 Krakow, Poland — 3Department of Physics, Univ. of Oslo, N-0316 Oslo, Norway
Photoionization to the O2+ X 2Πg state and to the N2+ A 2Πu state is studied using photoelectron spectroscopy.
In the case of molecular oxygen, the vibrational branching ratios for the v = 0-3 levels are recorded in the 19-31 eV region. Using many body perturbation theory, branching ratios and cross sections are calculated. Molecular states which autoionize to the O2+ X 2Πg state continuum are discussed.
In the case of molecular nitrogen, the branching ratios for the v = 0-3 levels are recorded in the 20-34 eV region showing strong non Franck-Condon effects around 22 eV. The study indicates that the Franck-Condon breakdown in the photoionization of the N2 1πu electron is due to autoionization from Rydberg and valence states of N2.